. >>> the obama administration does being asked to justify drone strikes, r against al qaeda linked american citizens. abc news reporter is in washington with more on the story. >> when he took office the president put a stop to some tactics he asked torture. like water boarding but through vikes the administration is taking aim at more than 300 suspected targets. >> the methods are designed to avoid civilian casualty autos this week a 16 page document that says american citizens that are tide al qaeda can be killed. if quote, an informed high level official believes the target poses a threat. the key says the government is not required to have clear evidence n 2011 one man was killed in yemen, an american citizen but a top al yaed leader linked to several terrorist attacks. human rights advocates says the memo goes way too far. >> justifies a claim executive branch can be judge, jury ask executionner. >> retired general stanley mccrystal says drone strikes are going to be more important in the future there should be more thoughtful debate about the use. >> if the threshold gets too low we'l